A NOTE has been added to this issue. ====================================================================== <https://bugtrack.alsa-project.org/alsa-bug/view.php?id=2287> ====================================================================== Reported By: cruiseoveride Assigned To: ====================================================================== Project: ALSA - lib Issue ID: 2287 Category: 0_general Reproducibility: always Severity: crash Priority: normal Status: new ====================================================================== Date Submitted: 07-16-2006 18:03 CEST Last Modified: 07-17-2006 16:07 CEST ====================================================================== Summary: Segfaults all functions after snd_pcm_hw_params_get_buffer_size (params,(snd_pcm_uframes_t *) & val); Description: I am new to Alsa and am not happy at all at the state of documentation available. You guys seriously need to do something about this. I have an M-Audio Audiophile Delta 192 (ICE1724) and I want to port envy24control for this chip, However I first need to familiar myself with the ALSA API. So I began by looking for simple examples on how to use ALSA API and came accross the followinf prog (Attached file test.c). The program compiles cleanly with gcc-4.1 and runs, however after it prints out the ..."buffer size = 8192 frames" It segfaults. If you slash out line 104, it resolves the issue. My question is, Is there a bug in this function? Code was obtained from http://www.linuxjournal.com/article/6735 ====================================================================== ---------------------------------------------------------------------- cruiseoveride - 07-17-06 14:59 ---------------------------------------------------------------------- by the way, thanks ray for the links, even though ALSA API is as colourful (descriptive) as bleach. You guys really need to put up some small code snippets with each function, to show how its used. Like with the Gtk API http://www.gtk.org/api/2.6/gtk/GtkFileChooser.html Otherwise god only knows wat the hell a HCTL is. Function prototypes alone are too cryptic to understand what they are doing. Give us some examples please and not 100+ linex, just a little snippet. ok anyways, back to topic. the output of [vikky@server ~]$ amixer -c2 contents numid=1,iface=CARD,name='ICE1724 EEPROM' ; type=BYTES,access=r----,values=52 : values=0x36,0x32,0x14,0x12,0x13,0x02,0x68,0x80,0xf8,0xc3,0xba,0xff,0x7f,0x45 ,0x00,0x00,0xb5,0x00,0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 ,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x45,0x00,0x00,0x00,0xb5,0x00 ,0x40,0x00,0xba,0xff,0x7f,0x00 numid=6,iface=MIXER,name='IEC958 Playback Route' ; type=ENUMERATED,access=rw---,values=1,items=5 ; Item #0 'PCM Out' ; Item #1 'H/W In 0' ; Item #2 'H/W In 1' ; Item #3 'IEC958 In L' ; Item #4 'IEC958 In R' : values=0 numid=7,iface=MIXER,name='IEC958 Playback Route',index=1 ; type=ENUMERATED,access=rw---,values=1,items=5 ; Item #0 'PCM Out' ; Item #1 'H/W In 0' ; Item #2 'H/W In 1' ; Item #3 'IEC958 In L' ; Item #4 'IEC958 In R' : values=2 numid=8,iface=MIXER,name='IEC958 Output Switch' ; type=BOOLEAN,access=rw---,values=1 : values=on numid=2,iface=MIXER,name='Multi Track Internal Clock' ; type=ENUMERATED,access=rw---,values=1,items=16 ; Item #0 '8000' ; Item #1 '9600' ; Item #2 '11025' ; Item #3 '12000' ; Item #4 '16000' ; Item #5 '22050' ; Item #6 '24000' ; Item #7 '32000' ; Item #8 '44100' ; Item #9 '48000' ; Item #10 '64000' ; Item #11 '88200' ; Item #12 '96000' ; Item #13 '176400' ; Item #14 '192000' ; Item #15 'IEC958 Input' : values=13 numid=5,iface=MIXER,name='Multi Track Peak' ; type=INTEGER,access=r----,values=22,min=0,max=255,step=0 : values=0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 numid=3,iface=MIXER,name='Multi Track Rate Locking' ; type=BOOLEAN,access=rw---,values=1 : values=on numid=4,iface=MIXER,name='Multi Track Rate Reset' ; type=BOOLEAN,access=rw---,values=1 : values=on numid=10,iface=PCM,name='IEC958 Playback Con Mask',device=1 ; type=IEC958,access=r----,values=1 : values=? numid=9,iface=PCM,name='IEC958 Playback Default',device=1 ; type=IEC958,access=rw---,values=1 : values=? numid=11,iface=PCM,name='IEC958 Playback Pro Mask',device=1 ; type=IEC958,access=r----,values=1 : values=? [vikky@server ~]$ wat does "?" mean for the values of numids 10,9,11 My methodology for porting envy24control was to first hack amixer to get familar with how to set parameters on the card and then brute force attack envy24control into ice24control. I have tried to email Jaroslav Kysela <perex@xxxxxxx> but with no response. Do you have any ideas on which file to break first, i was thinking evy24control.c? ---------------------------------------------------------------------- Raymond - 07-17-06 16:07 ---------------------------------------------------------------------- The functions snd_ctl_*() in alsa-lib/src/control/control.c is much easier to use than snd_hctl_*() alsa-lib/src/control/hcontrol.c If you know gtk2 well, it is much easier to hack envy24control.c instead of study amixer.c or alsamixer.c Issue History Date Modified Username Field Change ====================================================================== 07-16-06 18:03 cruiseoveride New Issue 07-16-06 18:03 cruiseoveride File Added: test.c 07-16-06 20:38 cruiseoveride Issue Monitored: cruiseoveride 07-17-06 02:44 Raymond Note Added: 0011032 07-17-06 02:47 Raymond Note Edited: 0011032 07-17-06 03:18 Raymond Note Edited: 0011032 07-17-06 05:45 cruiseoveride Note Added: 0011033 07-17-06 05:46 cruiseoveride Note Edited: 0011033 07-17-06 07:31 Raymond Note Added: 0011035 07-17-06 08:23 Raymond Note Added: 0011036 07-17-06 08:26 Raymond Note Edited: 0011036 07-17-06 14:48 cruiseoveride Note Added: 0011039 07-17-06 14:59 cruiseoveride Note Added: 0011040 07-17-06 16:07 Raymond Note Added: 0011042 ====================================================================== ------------------------------------------------------------------------- Using Tomcat but need to do more? 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